664765533 has 12 divisors (see below), whose sum is σ = 965194620. Its totient is φ = 440879616.

The previous prime is 664765477. The next prime is 664765547. The reversal of 664765533 is 335567466.

It can be written as a sum of positive squares in 2 ways, for example, as 391921209 + 272844324 = 19797^2 + 16518^2 .

It is not a de Polignac number, because 664765533 - 2⁶ = 664765469 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664765583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 189618 + ... + 193091.

It is an arithmetic number, because the mean of its divisors is an integer number (80432885).

Almost surely, 2^664765533 is an apocalyptic number.

It is an amenable number.

664765533 is a deficient number, since it is larger than the sum of its proper divisors (300429087).

664765533 is a wasteful number, since it uses less digits than its factorization.

664765533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382908 (or 382905 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 45.

The square root of 664765533 is about 25783.0473955272. The cubic root of 664765533 is about 872.7492775199.

The spelling of 664765533 in words is "six hundred sixty-four million, seven hundred sixty-five thousand, five hundred thirty-three".